TED-AJ03-520 THE NUMERICAL SIMULATION ON UNSTABLE BEHAVIORS OF PREMIXED FLAMES GENERATED BY HYDRODYNAMIC AND DIFFUSIVE-THERMAL EFFECTS
スポンサーリンク
概要
- 論文の詳細を見る
Unstable behaviors of premixed flames generated by hydrodynamic and diffusive-thermal effects are studied by two-dimensional unsteady calculations of reactive flows. In the present numerical simulation, the compressible Navier-Stokes equation including a one-step irreversible chemical reaction is employed. We consider two basic types of phenomena to account for the intrinsic instability of premixed flames, i. e., hydrodynamic and diffusive-thermal effects. The hydrodynamic effects is caused by the thermal expansion through flame fronts; the diffusive-thermal effect is caused by the preferential diffusion of mass and heat. A disturbance with the characteristic wavelength λ, which corresponds to the maximum growth rate, is superimposed on a stationary planar flame, and the formation of cellular flames generated by hydrodynamic and diffusive-thermal effects is numerically simulated. When the Lewis number Le is 0.5 (<1), i. e., when the diffusive-thermal effect has a destabilizing influence, unstable behaviors of cellular flames appear. The division and combine of cells of premixed flames are also observed (see Fig. 1). On the other hand, when Le is 1.0,i. e., when the diffusive-thermal effect has no influence, unstable behaviors disappear and cellular flames are stable (see Fig. 2). The results suggest that the diffusive-thermal effect has an important role in the appearance of unstable behaviors of cellular flames.[figure]
- 一般社団法人日本機械学会の論文
著者
-
KOBAYASHI Hideaki
Institute of Fluid Science, Tohoku University
-
Kadowaki Satoshi
Department Of Mechanical Engineering Nagaoka University Of Technology
-
Mashiko Takayuki
Department of Mechanical Engineering, Nagaoka University of Technology
-
Mashiko Takayuki
Department Of Mechanical Engineering Nagaoka University Of Technology
-
Kobayashi Hideaki
Institute Of Fluid Science Tohoku University
関連論文
- Development of an Ethanol Reduced Kinetic Mechanism Based on the Quasi-Steady State Assumption and Feasibility Evaluation for Multi-Dimensional Flame Analysis
- B104 IGNITION TIMES OF n-DECANE DROPLET ARRAY IN HIGH-TEMPERATURE LOW-SPEED AIRFLOW(Droplet/particle combustion-1)
- Effect of the Location of an Incident Shock Wave on Combustion and Flow Field of Wall Fuel-Injection
- Laminar Burning Velocity of Stoichiometric CH_4/air Premixed Flames at High-Pressure and High-Temperature
- A Study of Interaction between Shock Wave and Cross-Flow Jet Using Particle Tracking Velocimetry
- Effects of Turbulence on Flame Structure and NOx Emission of Turbulent Jet Non-Premixed Flames in High-Temperature Air Combustion(Advanced Fluid Information)
- TED-AJ03-375 A STUDY OF LAMINAR BURNING VELOCITY FOR H_2/O_2/He PREMIXED FLAME AT HIGH PRESSURE AND HIGH TEMPERATURE
- Time Series Analysis on the Emission of Light from Methane-Air Lean Premixed Flames : Diagnostics of the Flame Instability
- Experiments on Flame Spread of a Fuel Droplet Array in a High-Pressure Ambience
- Flame Stabilization Mechanism of a Newly Devised Strut for the Scramjet Engine